Malicious PDF — malware analysis report

Static analysis result for SHA-256 376679196acd8559…

MALICIOUS

PDF

76.9 KB Created: 2021-07-05 12:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b5c11c698f352b63807ad8149900749b SHA-1: b237545152e2f9b6dbd4a742f91f196a22783d9e SHA-256: 376679196acd8559c8a66e26c5f5c84ad203922d6032cec70db28d7688587498
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade initial gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/d5edb29f4d5b578035b66635a3653418/2171740749.pdf In PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/00d0b1042175c441262bb9dcf9ba401a/fugejutu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b9ad2a0e82d204c83e401425bd8f9cb/50942007760.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160dca3eb0e42f---54468089406.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/17180255942.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ffkamrd73hrmvr7fegpn7qrvn0/86882019482.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/xododemifejero.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/80544014316.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c260dc8d---42345287476.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8cbbec2f3---59442076878.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4230452148ae558410f1df7718de7e37/92886764280.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/16625474125.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/kejafofagimuteleg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55731d6e8---gabujuguvuvezewavivamewat.pdfIn PDF document text
    • http://bakoca.hu/files/file/5867252238.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/ligexavu.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/86385087921.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/22711398836.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c98bf06cb---34674613934.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/nanikibibopabasejiva.pdfIn PDF document text
    • https://mszukam.pl/dat//file/18745103117.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/3019117315.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/11d09295754d1a6c93f7ba7466661f1e/19426032501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cancer+principles+and+practice+of+oncology+11th+edition+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 11096 bytes
SHA-256: 64dfd5d6e320d1cb35a48e17ea5f3853e4b54b3d4d2f8c3dfb71a473122033f0
font_01_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 16608 bytes
SHA-256: 717beb55e3ee6ccbf27ed551b4714be1bf411259715bdbbaf7da61b438452eac

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